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3\left(3x-5\right)+30=12x-2\left(8+x\right)
Multiply both sides of the equation by 6, the least common multiple of 2,3.
9x-15+30=12x-2\left(8+x\right)
Use the distributive property to multiply 3 by 3x-5.
9x+15=12x-2\left(8+x\right)
Add -15 and 30 to get 15.
9x+15=12x-16-2x
Use the distributive property to multiply -2 by 8+x.
9x+15=10x-16
Combine 12x and -2x to get 10x.
9x+15-10x=-16
Subtract 10x from both sides.
-x+15=-16
Combine 9x and -10x to get -x.
-x=-16-15
Subtract 15 from both sides.
-x=-31
Subtract 15 from -16 to get -31.
x=31
Multiply both sides by -1.